Write the DP2 specific VFREQ registers.
This is preparation for enabling 128b/132b SST. This path is not
reachable yet.
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 64528ff8856e..91e6cd91e91f 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3467,8 +3467,20 @@ static void intel_ddi_enable(struct intel_atomic_state *state,
{
struct intel_display *display = to_intel_display(encoder);
struct intel_crtc *pipe_crtc;
+ enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
int i;
+ /* 128b/132b SST */
+ if (intel_dp_is_uhbr(crtc_state)) {
+ const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+ u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
+
+ intel_de_write(display, TRANS_DP2_VFREQHIGH(cpu_transcoder),
+ TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
+ intel_de_write(display, TRANS_DP2_VFREQLOW(cpu_transcoder),
+ TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
+ }
+
intel_ddi_enable_transcoder_func(encoder, crtc_state);
/* Enable/Disable DP2.0 SDP split config before transcoder */
--
2.39.5
